I own two NV200 cargo vans, both with no windows in the rear doors. I created a hack of the reversing camera system in order to provide a virtual rear-view mirror. This is great for seeing Blind spots when driving on the highway. Simply flip a switch and see what’s behind you on the reversing camera. This hack adds a diode in order to avoid turning on the reversing lights. Both of 2015 and the 2018 vans were identical from the standpoint of this hack. Here is a YouTube video of how to do it.